506887-01
Page 64 of 78
Issue 1213
Service
At the beginning of each heating season, system should be
checked as follows by a qualified service technician:
Blower
Check the blower wheel for debris and clean if necessary.
The blower motors are prelubricated for extended bearing
life. No further lubrication is needed.
WARNING
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death or property
damage.
Improper servicing could result in dangerous operation,
serious injury, death, or property damage.
Before servicing, disconnect all electrical power to
furnace.
When servicing controls, label all wires prior to
disconnecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.
WARNING
The blower access panel must be securely in place when
the blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
Filters
All filters are installed external to the unit. Filters should be
inspected monthly. Clean or replace the filters when
necessary to ensure proper furnace operation. Table 1 lists
recommended filter sizes.
Exhaust and air intake pipes
Check the exhaust and air intake pipes and all connections
for tightness and to make sure there is no blockage.
NOTE:
After any heavy snow, ice or frozen fog event the
furnace vent pipes may become restricted. Always check
the vent system and remove any snow or ice that may be
obstructing the plastic intake or exhaust pipes.
Electrical
1.
Check all wiring for loose connections.
2.
Check for the correct voltage at the furnace (furnace
operating).Correct voltage is /- 10%.
3.
Check amp-draw on the blower motor with the blower
access panel in place.
Motor Nameplate_____________ Actual___________
Winterizing and Condensate Trap Care
1.
Turn off power to the unit.
2.
Have a shallow pan ready to empty condensate water.
3.
Remove the drain cap from the condensate trap and
empty water. Inspect the trap then reinstall the drain
cap.
Cleaning Heat Exchanger
If cleaning the heat exchanger becomes necessary, follow
the below procedures and refer to Figure 1 when
disassembling unit. Use papers or protective covering in
front of furnace while removing heat exchanger assembly.
1.
Turn off electrical and gas supplies to the furnace.
2.
Remove the furnace access panels.
3.
Disconnect the 2 pin plug from the gas valve.
4.
Remove gas supply line connected to gas valve.
Remove the burner box cover and remove gas valve
manifold assembly.
5.
Remove sensor wire from sensor. Disconnect 2 pin
plug from the ignitor.
6.
Disconnect wires from flame rollout switches.
7.
Remove four burner box screws at the vestibule panel
and remove burner box. Set burner box assembly aside.
NOTE:
If necessary, clean burners at this time. Follow
procedures outlined in Burner Cleaning section.
8.
Loosen the clamps to the flexible exhaust coupling.
9.
Disconnect condensate drain line from the cold end
header box.
10. Disconnect condensate drain tubing from flue collar.
Remove screws that secures the flue collar into place.
Remove flue collar. It may be necessary to cut the exiting
exhaust pipe for removal of the fitting.
11. Mark and disconnect all combustion air pressure tubing
from cold end header collector box.
12. Mark and remove wires from pressure switches.
Remove pressure switches. Keep tubing attached to
pressure switches.
13. Disconnect the 4 pin plug from the combustion air
inducer. Remove two screws which secure combustion
air inducer to collector box. Remove combustion air
inducer assembly. Remove ground wire from vest panel.
14. Remove electrical junction box from the side of the
furnace.
15. Mark and disconnect any remaining wiring to heating
compartment components. Disengage strain relief
bushing and pull wiring and bushing through the hole in
the blower deck.
16. Remove the primary limit from the vestibule panel.
17. Remove two screws from the front cabinet flange at the
blower deck. Spread cabinet sides slightly to allow
clearance for removal of heat exchanger.
Summary of Contents for A97USMV
Page 3: ...506887 01 Page 3 of 78 Issue 1213 A97USMV Exploded View Figure 1 ...
Page 16: ...506887 01 Page 16 of 78 Issue 1213 Figure 17 ...
Page 28: ...506887 01 Page 28 of 78 Issue 1213 Trap Drain Assembly using 1 2 PVC or 3 4 PVC Figure 38 ...
Page 35: ...506887 01 Page 35 of 78 Issue 1213 ...
Page 36: ...506887 01 Page 36 of 78 Issue 1213 Figure 46 ...
Page 39: ...506887 01 Page 39 of 78 Issue 1213 ...
Page 40: ...506887 01 Page 40 of 78 Issue 1213 Typical A97USMV Wiring Diagram Figure 47 ...
Page 41: ...506887 01 Page 41 of 78 Issue 1213 Integrated Control Figure 48 ...
Page 42: ...506887 01 Page 42 of 78 Issue 1213 Low Voltage Field Wiring Table 14 2 Stage Single Stage ...
Page 46: ...506887 01 Page 46 of 78 Issue 1213 BLOWER DATA ...
Page 47: ...506887 01 Page 47 of 78 Issue 1213 BLOWER DATA ...
Page 48: ...506887 01 Page 48 of 78 Issue 1213 BLOWER DATA ...
Page 49: ...506887 01 Page 49 of 78 Issue 1213 BLOWER DATA ...
Page 50: ...506887 01 Page 50 of 78 Issue 1213 BLOWER DATA ...
Page 51: ...506887 01 Page 51 of 78 Issue 1213 BLOWER DATA ...
Page 52: ...506887 01 Page 52 of 78 Issue 1213 BLOWER DATA ...
Page 53: ...506887 01 Page 53 of 78 Issue 1213 BLOWER DATA ...
Page 54: ...506887 01 Page 54 of 78 Issue 1213 BLOWER DATA ...
Page 55: ...506887 01 Page 55 of 78 Issue 1213 TABLE 22 ...
Page 56: ...506887 01 Page 56 of 78 Issue 1213 TABLE 23 ...
Page 60: ...506887 01 Page 60 of 78 Issue 1213 Figure 50 ...
Page 68: ...506887 01 Page 68 of 78 Issue 1213 ...
Page 69: ...506887 01 Page 69 of 78 Issue 1213 ...
